Improved process for purifying coal-oil



i UNITED STATES ROBERT A. OHESEBROUGH, or NEW YORK, N, Y.

IMPROVED PROCESSFOR PURIFYING COAL;OIL,,&.C.I

Specification forming part of Letters Patent No. 49,502, dated August 22, 18 65.

To all whom it may concern:

Be it known that I, ROBERT A. GHESE- BROUGH, of 124 Maiden lane, city of New York and State of New York, have invented a new and useful Method of Purifying Goal0il and Petroleum by Filtration; and I do hereby declare that the following is a full and exact description thereof.

The nature of my invention consists in the use of bone-black for purifying petroleum or coal oils by filtration by first distilling the crude coal-oil or petroleum in a still with a condensing-worm, such as is commonly use for distilling the same. a i i The products ofdistillation are benzole, illuminating-oil, and heavy oil, which 1 then filter either separately or combined, as follows: The material I use for filtering through is boneblack made of charred bones. The filter is made of wood or iron, of any suitable form and height. The filter is filled up with the boneblaok as high as may be necessary, according to the quality of the oil. The oil is run in on top ofthe filtering material and allowed to filter PATENT OFFICE,

through the perforated bottom of the filter, where it is collected. The operation is con tinued by feeding theoil into the top of the filter as fast as it runs through the filtering, material until the filtered oil shall begin to i assume a dark eolor,when theoperation is suspended and the filter replenished by fresh material. i 1. I

The coal oil or petroleumrefined by this pro cess will be sweet in odor, of a light color, and will need no other treatment. p

The crude petroleum from the wells may be purified by this processwithoutany previous distillation, either forpurposes of illumination or lubrication. y y

What I claihi as my invention secure by Letters Patent,is--

The use of bone-black for purify or coal oils by filtration."

ROBT. AQoHES BRO GHQ Witnesses: i i 3 J. FRANKLIN REIGART, EDM. F. BROWN. j

, and desire to in g petroleum 

